| Issuer: | Commonwealth Edison Company | |
| Ratings: | Baa2 (Stable) (Moody’s) | |
| BBB- (Positive) (S&P) | ||
| BBB (Stable) (Fitch) | ||
| Principal Amount: | $425,000,000 | |
| Title of Securities: | First Mortgage 6.15% Bonds, Series 106, due 2017 | |
| Legal Format: | SEC-Registered (Registration No. 333-133966) | |
| Settlement Date: | September 10, 2007 | |
| Maturity Date: | September 15, 2017 | |
| Issue Price: | 99.718% of principal amount, plus accrued interest, if any, from September 10, 2007 | |
| Coupon: | 6.15% | |
| Benchmark Treasury: | 4.750% due August 2017 | |
| Spread to Benchmark: | 163 basis points (1.63%) | |
| Treasury Yield: | 4.558% | |
| Reoffer Yield: | 6.188% | |
| Interest Payment Dates: | Semi-annually on March 15 and September 15, commencing on March 15, 2008 | |
| Redemption Provisions: | ||
| Make-whole call: | At any time at a discount rate of Treasury rate plus 25 basis points | |
| CUSIP: | 202795 HS2 | |
| Joint Book-Running Managers: | Credit Suisse Securities (USA) LLC Morgan Stanley & Co. Incorporated Wachovia Capital Markets, LLC | |
| Co-Managers: | ABN AMRO Incorporated | |
| Dresdner Kleinwort Securities LLC | ||
| Loop Capital Markets, LLC | ||
| Popular Securities, Inc. |
